my calculations are very simple ,just using the official numbers without any hidden or conspiracy theories like ravesky.
based on last year (DV2013) and according to official numbers there were 16K selected from Asia (this number is quite constant and you can see it in all previous years statistics ) , so with the increasing of the 19% (16K * 1.19 = 19K) , this year there will be around 19K selected from Asia.
what we are not sure of is the holes ( this is changing every year)
you can see in the visa bulletin some years :
there were 10K-80K from Asia
and some year small like max 10K,
but all the time numbers of selected remains around 16K.
according to reports of users here and there largest number that has seen in asia is 26K.
so now i'll calculate the average space between numbers( Holes)
my prediction is to 19K selected , so ratio will be 26K/19 = 1.37 .
according to DV2013 all got current in august so if all current this means that the 16K selected will get interviewed if they submitted forms.
so
i'll take this number and ,multiply it with the holes ratio that is assumed 1.37 with the 16K of last lottery(DV2013)
1.37 * 16K = 22K , so this number should be interviewed until august.
OK, let's look at South America region.
We have 2206 winners in dv-13 and 1252 is the max number on CEAC. So, your point is that those 1252 numbers are entries, and 2206 are with family members. If there are no holes, and all 1252 numbers apply to KCC, and almost no denials are issued, that could be possible. Because for 101000 entries there are 217000 family members from SA.
However, let's look at largest country in SA - Venezuela, 924 winners. Do they all apply?
CEAC data for Venezuela (for June 1st when I ran it) shows only 156 entries and 415 including family members (well, in the consulate in Caracas, what is not exactly the same as Venezualan natives, but rather close to that). Out of 924 winners. Even if 924 include family members, only about half of them apply to KCC. It is hard to believe other countries in SA would show 100% while Venezuela would show only 50% rate. And how could those 1252 produce 2206 winners with so lo application rate?